Action for upright pianos.



No. 728,193, PATENTED MAY 19, 1903.

' E. BORNHOEFT.

ACTION FOR UPRIGHT PIANOS. v

APPLICATION FILED MAR. 21, 1903.

H0 MODEL.

FIG. 2

v UNITED STATES Patented May 19, 1903.

PATENT OFFICE.

EDWARD BORNHOEFT, OF NEW YORK, N. Y., ASSIGNOR TO DAVID H. SCHMIDT, OF NEW YORK, N. Y.

ACTION FOR UPRIGHT PIANOS.

SPECIFICATION forming part of Letters Patent No. 728,193, dated May 19, 1903.

Application filed March 21, 1908. Serial No. 148,813. (No model.)

To all whom, it may concern:

Be it known that I, EDWARD BORNHOEFT, a citizen of the United States, residing at New York city, (BronX,) county and State of New York, have invented certain new and useful Improvements in Actions for Upright Pianos, of which the following is a specification.

This invention relates to an improved action for upright pianos, and more particularly to novel means for controlling the stroke of the jack, so that it will always engage the hammer-butt at the point desired.

In the accompanying drawings, Figure 1 is a side elevation of an upright-piano action embodying my invention. Fig. 2 is a detail of the action-rail and adjoining parts; Fig. 3, a front view of the action-rail; Fig. 4:, a plan, partly in section, of Fig. 3; and Fig. 5, a detail of one of the perforated springs.

The letter a represents the action-rail of an upright-piano action. I) is the jack, and c the hammer.

To control the position of the jack with relation to the hammer-butt c, I secure to the front of the action-rail and between itand the jack a second adjustable rail d,,which I term the jack-rail. This rail dis received within a corresponding recess a of the action rail and extends along the entire action, being made, preferably,iu several sections. Between the rails a and (Z are interposed a num-. ber of leaf-sprin gs e, which are perforated, as at c, Fig. 5, for the reception of set screws f. These screws connect the jack-rail to the action-rail and serve at the same time to hold the springs in position. The front of the jack-rail, which faces the jack 1), is cushioned, as at g. 7

It will be seen that by turning the screws f the distance betweenthe jack-rail and the jack may be readily adjusted. The jack-rail will constitute a stop for the jack and control its fall or point of engagement with the hammer-butt. Thus by properly adjusting the jack-rail the stroke of the action may be regulated in a very simple and efiective manneiz.

2. An upright-piano action provided with a recessed action-rail, a second spring-influenced rail adj ustably secured thereto, and a jack adapted to engage the second rail, substantially as specified.

3. An upright-piano action provided with a recessed action-rail, a second rail, intervening perforated springs, set-screws passing through said springs, and a jack adapted to engage the second rail, substantially as specified.

'Signed by me at New York city, (Manhattan,) New York, this 20th day of March, 1903.

Witnesses:

F. v. BRIEsEN, EDWARD RAY. 

